Flu Shots: What’s Coming Part 1
Sherri Tenpenny Historically, influenza shots contained three attenuated (weakened) viruses: two strains of influenza A and one type of influenza B. That changed in 2012 when FluMist became the first, FDA-approved quadrivalent flu vaccine, with two strains of A and two strains of B. Link to Part 2:
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